Colloid mill



Patented Dee. 18, 1928.

UNITED- STATES PATENT OFFICE.' g

ANDREW FRASER, or cRoYDEN, ENGLAND.

`- COLLOID MILL.

Application ma August 7. 1.925, serial No. 48,818, and in creat Britainaugust 1s',- 1924.

`This invention relates to colloid mills of` lthe type in which twoco-operating disc members are mounted face to face and close togetherfor rotation `relatively to one another about an axis common to-both,and

lin which the material to be treated is fed iito the space between thedisc members at or approximately at the centre of rotation and isdischarged from. said space at a periphery of said members.

This invention contemplates the use of aA mill ofithe above type incircumstances where yit may be desired to introduce material of a solidor fluid nature atan intermediate point in the mill, that is to saybetween the centralinlet and the *peripheraly outlet. yFor example itmay be desired- Jto reduce some constituentl o1A constituents of thematerial to be treated to a. certain degrec of ineness before theincorporation of the other constituent or constituents. A

According to my invention the improved colloid mill comprises twointeiiitting disc like members having a passage -or duct `wherebymaterial can be introduced to the space between said disc members at ornear the centre of rotation and an additional passage or passageswhereby the material can be introduced to said space at7 a regionintermediatebetween the" termination of the.

. first mentioned passa-ge and periphery of vIl() the disc members. Byreason of the interfitting disc like -members the material is `preventedfrom being thrown outwardly too rapidly under centrifugal action.'

In one form of the invention an auxiliary supply conduit enters themill` concentric with the axis of the disc members and at itsinner endis constituted by Aa passage or passages extending through one of thedisc members and opening into the space between .them at the aforesaidintermediate region.

According to a further feature of the invention the co-operating facesof the disc members may he formed near the centre of rotation (forexample between this centre and the inlet end of the auxiliary conduitor conduits) with teeth or the like so that may be ground beforerea-ching that part. of .the mill at which they are reduced to a sizeapproaching colloidal dimensions.

, A still further feature of my invention` consists n providing one orboth of the disc members with means, for example glazed 'of light raysor selected light rays.

On the annexed sheet of drawings I have illustrated one embodiment of myinvention. whereon:

Figure 1 is a sectional elevation of a colloidal machine.

Figure 2 is a view of one of the rotating members.

The machine consists of two oo-related members a and b mounted' onshafts and i b1 journalled in bearings a and b2 respectively. K

Said members are of a somewhat conical formation, the. one fittingwithin the other and both are enclosedin an outer stationary casing orhousing c.'

Said shafts a1 and b1 are provided with pulleys a3 and?)3 so that bybelt gearing theyand therefore themembers and be carried thereby canbefrotated Vand in opposite directions to obtain a high relative speed.

The adjacent faces of the meinbersa b are corrugated concentrically. p

- Shaft a is hollow'so that the material or and , mixture to beteatedcan be fed therethrough to the space between the members.

In operation the said shafts are rotated in' opposite directions -at ahigh speed and the material to be treated fed through the hollow shaft aas aforesaid and then commences to pass outwards between the faces undercentrifuga-l. action.' This movement is howtrifugal action intolthecasing c from which it passes by'way of a suitable outlet d.

The member a: vmay be provided with passagesf which are'in communicationwith the space between. the-rotating faces and also with radial passagesg which latter ware in communication with a supply duct l1,

in the shaft a. By such means liquids, solids, or gasesV can be added tothe mixture being treated while the material is passing between thesaid'rotating faces. v The adjacent faces .of said members may'V tapertowards each other from theeentre of no ever retarded by the interttingcorruga` the machine to the periphery thereof. That is, the material ismore closely confined as it passes outwards under centrifugal action sothat the particles are subjected to an increasing grinding action.

Thus where the size of the particles to be treated is such that thenecessary velocity cannot be imparted thereto by the rotation of saidmember or .members to form the material into a colloid, the particlesare first subjected to a grinding action between the members and arethereby reduced in size before being formed into a colloid.

To further assist in this action the two members may be provided withcutting teeth, grinders, or the Ilike, .not shown, located near thecentre of rotation, the teeth, grinders or the like secured to the onemember co-operating with those secured to the other member so as togrind the material 'between same.

ling, the liquid incorporated with the material being partly or whollyvaporized and separated when the material is thrown clear of the mill bycentrifugal action.

Likewise the machine may be used for `grinding granular material to avery fine powder and also for mixing materials, either solid or solidsand liquids and also in theproduction of emulsions.

1.A colloid mill comprising two disc members mounted face to face andclose together for rotation relatively to one another about an axiscommon to both, a part of the opposed faces of said members lyin at anangle to the axis of rotation, a con uit terminating in the spacebetween said members near the axis of rotation, a second conduitconcentric with the axis of rotation, at least one passage extendingfrom the latter conduit through one of the disc members, and terminatingin the space between the disc members between the termi nation of thefirst mentioned conduit and the periphery of said members.

2. A colloid mill comprising two co-operating disc members mounted on anaxis common to both, a conduit to conduct material to the space betweensaid faces and a conduit to conduct additional material to the saidspace at a point intermediate bctween the termination of the firstconduit and periphery of said disc members, and means to admit lightrays to the material passing throu h said space.

3. A colloi mill comprising two interfitting disc members mounted faceto face and close together for rotation relative to one another about anaxis common to both, an axial passage through one member and terminatingin the space between the two members, a conduit through said passage,and at least one conduit leadin therefrom and terminating in said spaceetween the termination of the said passage and periphery of the discs.

4. A colloid mill comprising two intertting dise members mounted face toface and elose'together for rotation relative to one another about anaxis common to both, corrugations concentric with the axis of rotation,the rojecting portions of the one member pro]ecting into the grooves ofthe other, an axial passage through one member and terminating in thespace between the two members, a conduit through said passage and atleast one conduit leading therefrom and terminating in said spacebetween the termination of the said passage and periphery of the discs.

` 5. A colloid mill comprising two co-operating disc members mounted onan axis common to both, a conduit to conduct material to the spacebetween said faces and a conduit to conduct additional material to thesaid space at a point intermediate between the termination of the firstconduit and periphery of said disc members and a glazed port provided inat least one of said disc members to admit light to the material passingthrough said space.

ANDREW FRASER.

